Vol. 54 No. 3 (2017)   Mitsubishi Hitachi Power Systems
Technical Papers

Advanced Water Treatment Technologies (High-AVT) for HRSG Corrosion Control corresponding to New JIS B8223 (Japanese Industrial Standards)

SENICHI TSUBAKIZAKI
TAKAYUKI WADA
TAKAYOSHI IWATO
TSUYOSHI NAKAHARA
MITSURU NAKAMOTO
YOSHINORI NOGUCHI

In October 2015, JIS B8223 (Boiler feedwater and boiler water quality standards) was revised and issued, and for the Heat Recovery Steam Generator (HRSG) of combined cycle plant, the operational standards for High-AVT (high pH) water treatment that Mitsubishi Hitachi Power Systems, Ltd. (MHPS) has applied at actual plants since 2001 were adopted. High-AVT water treatment has been increasingly applied as a measure against Flow Accelerated Corrosion and phosphate corrosion problems both inside and outside Japan and is useful as an alternative technology to hydrazine, the carcinogenicity of which has been pointed out. In addition, from an economic point of view, the advantages of the adoption of High-AVT water treatment, such as the shortening of plant start-up time and the reduction of operating costs, have been verified.